PSINET INC
SC 13D/A, EX-4, 2000-11-02
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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                                                                       Exhibit 3
                                                                       ---------
                          REGISTRATION RIGHTS AGREEMENT

     This REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of November
1, 2000,  is entered into by and between  PSINet  INC.,  a New York  corporation
("PSINet"),  and  XPEDIOR  INCORPORATED,  a  Delaware  corporation  ("Xpedior").
Capitalized  terms used in this  Agreement and not defined in context shall have
the meanings ascribed to them in Section 5(h).

     WHEREAS,  this Agreement is made pursuant to the Stock Purchase  Agreement,
dated as of November 1, 2000, by and between  PSINet and Xpedior (the  "Purchase
Agreement");

     NOW,  THEREFORE,  in  consideration  of  the  foregoing  premises  and  the
representations,  warranties and agreements  contained herein and for other good
and  valuable  consideration,  the  receipt  and  adequacy  of which are  hereby
acknowledged,  the  parties  hereto,  intending  to be legally  bound,  agree as
follows:

     1.  Demand Shelf Registration.
         ---------------------------

         (a) Subject to Section 2(f), from time to time, on or prior to the 60th
day (or, if such date is not a Trading Day, the next Trading Day following  such
60th day) (the  "Filing  Date")  after the  delivery  to Xpedior by Holders of a
majority in  interest of the  Registrable  Securities  of a notice (the  "Demand
Notice") demanding that Xpedior register such Holders'  Registrable  Securities,
Xpedior  shall  prepare and file with the SEC a "shelf"  Registration  Statement
covering all or any portion of the Registrable  Securities for an offering to be
made on a  continuous  basis  pursuant  to Rule 415  under the  Securities  Act;
provided,  however,  that the  Holders may only  deliver  three  Demand  Notices
pursuant to this Section 1. Such Registration Statement shall be on Form S-3 or,
if Xpedior is not then  eligible  to register  the  Registrable  Securities  for
resale on Form S-3, such Registration  Statement shall be on another appropriate
form in accordance  herewith,  which form shall be reasonably  acceptable to the
Holders.  Subject to Section 2(f), Xpedior shall use its reasonable best efforts
to  cause  such  Registration  Statement  to be  declared  effective  under  the
Securities  Act within  120 days after the  delivery  of the  applicable  Demand
Notice,  but in any event no later  than the date  which is the  earlier  of the
fifth day after (i) Xpedior is advised by the SEC that the SEC has no additional
comments to such Registration Statement, and (ii) Xpedior receives a "no review"
notice from the SEC (or, if such date is not a Trading Day, the next Trading Day
following such date) (in each case, the "Effectiveness  Date"), and to keep such
Registration Statement continuously effective under the Securities Act until the
date which is two years after the applicable  Effectiveness Date or such earlier
date when all Registrable Securities covered by such Registration Statement have
been sold or may be sold without volume restrictions  pursuant to Rule 144 under
the  Securities  Act, as  determined  by counsel to Xpedior  (in each case,  the
"Effectiveness  Period"). If an additional Registration Statement is required to
be filed  because  the  actual  number of shares of Common  Stock into which the
Series B Preferred  Stock is convertible  exceeds the number of shares of Common
Stock initially  registered in respect of the Series B Preferred Stock,  subject
to Section  2(f)  Xpedior  shall have 30  Trading  Days to file such  additional
Registration Statement.  Once the
<PAGE>
                                      -2-

third  Registration  Statement  filed  pursuant to this Section 1(a) is declared
effective by the SEC, the Holders of the Series B Preferred Stock shall not have
the right to make any  additional  demands for  registration  under this Section
1(a),  other than demands to register  additional  shares of Common Stock in the
circumstances set forth in the preceding sentence.

         (b) If the  Holders  of a majority  of the  Registrable  Securities  so
elect,  an  offering  of  Registrable  Securities  pursuant  to  a  Registration
Statement may be effected in the form of an Underwritten Offering, certain costs
and expenses of which will be paid in  accordance  with Section  3(b),  provided
that a managing  underwriter is selected pursuant to Section 1(c). Xpedior shall
not be  required  to effect more than three  Underwritten  Offerings  under this
Agreement and shall not be required to effect an Underwritten Offering unless at
the time of a written request of the Holders  electing an Underwritten  Offering
the average  daily  trading  volume of the Common  Stock on the Nasdaq  National
Market (or such other market or quotation system on which Xpedior's Common Stock
is then quoted or listed) during the period of 60 days immediately prior to such
request  shall be less than  50,000  shares  (subject  to  adjustment  for stock
splits,  reverse stock splits,  recapitalizations  and similar events).  In such
event,  and if the  managing  underwriter  advises  Xpedior and such  Holders in
writing that in its opinion the amount of Registrable  Securities proposed to be
sold in such Underwritten Offering exceeds the amount of Registrable  Securities
which can be sold in such Underwritten Offering, there shall be included in such
Underwritten  Offering only the amount of such  Registrable  Securities which in
the opinion of such managing  underwriter  can be sold, and such amount shall be
allocated pro rata among the Holders proposing to sell Registrable Securities in
such Underwritten Offering.

         (c)  If  any  of  the  Registrable  Securities  are  to be  sold  in an
Underwritten  Offering,  the  managing  underwriter  that will  administer  such
offering  (which  managing   underwriter  shall  be  of  national  standing  and
reputation) shall be selected by the  participating  Holders with the consent of
Xpedior,  which  consent  shall  not  be  unreasonably   withheld,   delayed  or
conditioned.  No Holder may participate in any Underwritten  Offering  hereunder
unless such Person (i) agrees to sell its  Registrable  Securities  on the basis
provided in any underwriting agreements described in Section 2(a)(xii), and (ii)
completes  and executes  all  questionnaires,  powers of attorney,  indemnities,
underwriting  agreements  and other  documents  required under the terms of such
arrangements.  No Holder may participate in any  registration  hereunder  unless
such Holder executes and delivers an agreement not to divulge any proprietary or
confidential  information  of Xpedior or any of its  subsidiaries  which becomes
known to such Holder in connection with any such registration.

     2.  Registration Procedures.
         -------------------------

         (a)       In connection with each of Xpedior's registration obligations
hereunder, Xpedior shall:

                   (i) Not less than seven  Trading Days (or such longer  period
as may be  reasonably  practicable)  prior to the  intended  filing  date of the
Registration  Statement  or  any  related  Prospectus,  or of any  amendment  or
supplement  thereto (excluding any document that would be incorporated or deemed
to be  incorporated  therein by  reference),  Xpedior  shall (A)  furnish to the
Holders,  any one firm of counsel to the Holders (their  "Special  Counsel") and
any

<PAGE>
                                      -3-

managing  underwriter  copies of all such documents  proposed to be filed, which
documents  (other  than  those  incorporated  or  deemed to be  incorporated  by
reference) shall be subject to the review of such Holders, their Special Counsel
and such managing underwriter,  and (B) cause its officers,  directors,  counsel
and  independent  certified  public  accountants to respond to such inquiries as
shall be necessary,  in the  reasonable  opinion of  respective  counsel to such
Holders and any  managing  underwriter,  to conduct a  reasonable  investigation
within  the  meaning  of the  Securities  Act.  Xpedior  shall not file any such
Registration Statement or any such Prospectus,  or any amendments or supplements
thereto, to which the Holders of a majority of the Registrable Securities, their
Special Counsel or any managing  underwriter  shall reasonably object in writing
within four Trading Days of their receipt  thereof,  in which case Xpedior shall
revise such  Registration  Statement and Prospectus  substantially in accordance
with the  reasonable  comments of the  Holders of a majority of the  Registrable
Securities,  their Special Counsel or any managing underwriter until such Person
approves such  Registration  Statement and Prospectus for filing.  If Xpedior is
unable to file  such  Registration  Statement  with the SEC by the  Filing  Date
solely because of the additional  time necessary to address such comments,  then
the Filing Date shall be extended by the amount of time reasonably necessary for
Xpedior to make the  necessary  revisions  to such  Registration  Statement  and
Prospectus in order to receive filing approval from such Person.

                   (ii)  (A)  Prepare  and file  with  the SEC such  amendments,
including  post-effective  amendments,  to the Registration  Statement as may be
necessary to keep such Registration  Statement  continuously effective as to the
Registrable Securities throughout the applicable Effectiveness Period, (B) cause
the related Prospectus to be amended or supplemented by any required  Prospectus
supplement,  and as so  supplemented or amended to be filed pursuant to Rule 424
under the Securities Act, (C) respond as promptly as practicable to any comments
received from the SEC with respect to the Registration Statement, the Prospectus
or any  amendment  thereto and  promptly  provide the Holders  true and complete
copies of all  correspondence  from and to the SEC relating to the  Registration
Statement  and the  Prospectus,  and  (D)  comply  with  the  provisions  of the
Securities  Act and the  Exchange  Act with  respect to the  disposition  of all
Registrable   Securities  covered  by  the  Registration  Statement  during  the
applicable  period in accordance with the intended methods of disposition by the
Holders  thereof  set forth in the  Registration  Statement,  as so  amended  or
supplemented.

                   (iii)  Notify the  Holders of  Registrable  Securities  to be
sold,  their  Special  Counsel  and any  managing  underwriter  as  promptly  as
practicable (and, in the case of (A)(I) below, not less than three days prior to
such  filing)  and, if  requested  by any such  Person,  confirm  such notice in
writing  no later  than two  Trading  Days  following  the  day,  (A)(I)  when a
Prospectus  or any  Prospectus  supplement  or  post-effective  amendment to the
Registration  Statement  is  proposed  to be filed,  (II) when the SEC  notifies
Xpedior  whether  there will be a "review" of such  Registration  Statement  and
whenever the SEC comments in writing on such Registration  Statement,  and (III)
with respect to the Registration Statement or any post-effective amendment, when
the  same has  become  effective,  (B) of any  request  by the SEC or any  other
Federal or state  governmental  authority for  amendments or  supplements to the
Registration Statement or Prospectus or for additional  information,  (C) of the
issuance  by the SEC of any  stop  order  suspending  the  effectiveness  of the
Registration  Statement covering any or all of the Registrable Securities or the
initiation of any Proceedings for that purpose, (D) of the receipt by Xpedior of
any  notification  with  respect  to  the  suspension  of the  qualification  or
exemption from

<PAGE>
                                      -4-

qualification of any of the Registrable Securities for sale in any jurisdiction,
or the initiation or threatening of any Proceeding for such purpose,  and (E) of
the  occurrence  of any event  that could  reasonably  be  expected  to make any
statement made in the Registration  Statement or Prospectus,  or in any document
incorporated  or deemed to be incorporated  therein by reference,  untrue in any
material respect or that requires any revisions to the  Registration  Statement,
Prospectus  or  other  documents  such  that,  in the  case of the  Registration
Statement or the Prospectus,  as the case may be, it will not contain any untrue
statement of a material  fact or omit to state any material  fact required to be
stated  therein or necessary  to make the  statements  therein,  in light of the
circumstances  under which they were made, not  misleading;  provided,  however,
that  Xpedior  shall not be required to provide the Holders  with the details of
any such event if Section 2(f) shall be applicable to such event.

                   (iv) Use its  reasonable  best  efforts to avoid the issuance
of,  or, if issued,  obtain the  withdrawal  of,  (A) any order  suspending  the
effectiveness  of the  Registration  Statement,  or (B)  any  suspension  of the
qualification  (or  exemption  from  qualification)  of any  of the  Registrable
Securities for sale in any jurisdiction, as soon as reasonably practicable.

                   (v) If requested by any managing underwriter or by Holders of
a majority in interest of the  Registrable  Securities  to be sold in connection
with an  Underwritten  Offering,  (A)  promptly  incorporate  into a  Prospectus
supplement  or  post-effective  amendment  to the  Registration  Statement  such
information  concerning the manner of distribution of Registrable  Securities as
such managing  underwriter and such Holders  reasonably agree should be included
therein, and (B) make all required filings of such Prospectus supplement or such
post-effective  amendment  as soon as  practicable  after  Xpedior has  received
notification of the matters to be incorporated in such Prospectus  supplement or
post-effective amendment;  provided, however, that Xpedior shall not be required
to take any action  pursuant to this Section  2(a)(v) that would, in the opinion
of counsel for Xpedior,  violate applicable law or be materially  detrimental to
the business prospects of Xpedior.

                   (vi) Furnish to each Holder,  their  Special  Counsel and any
managing  underwriter,  without  charge,  at least  one  conformed  copy of each
Registration   Statement  and  each  amendment  thereto,   including   financial
statements  and  schedules,   all  documents   incorporated   or  deemed  to  be
incorporated  therein by  reference,  and all  exhibits  thereto,  to the extent
requested by such Person  (including those previously  furnished or incorporated
by reference) promptly after the filing of such documents with the SEC.

                   (vii) Promptly deliver to each Holder,  their Special Counsel
and  any  underwriters,  without  charge,  as  many  copies  of  the  Prospectus
(including each form of prospectus),  and each amendment or supplement  thereto,
as such Persons may reasonably  request;  and Xpedior hereby consents to the use
of such  Prospectuses  and each  amendment or supplement  thereto by each of the
selling Holders and any underwriters in connection with the offering and sale of
the Registrable  Securities  covered by such  Prospectuses  and any amendment or
supplement thereto.

                   (viii)   Prior  to  any  public   offering   of   Registrable
Securities,  (A) use its  reasonable  best  efforts to register  or qualify,  or
cooperate with the selling  Holders,  any underwriters and their Special Counsel
in connection  with the  registration or  qualification  (or

<PAGE>
                                      -5-

exemption  from  such  registration  or  qualification)   of,  such  Registrable
Securities  for offer and sale under the  securities  or "Blue Sky" laws of such
jurisdictions  within the United States as any Holder or underwriter requests in
writing,  (B)  keep  each  such  registration  or  qualification  (or  exemption
therefrom)  continuously  effective  throughout  the  applicable   Effectiveness
Period,  and (C) do any and all other acts or things  necessary  or advisable to
enable the  disposition  in such  jurisdictions  of the  Registrable  Securities
covered by a Registration Statement;  provided,  however, that Xpedior shall not
be required to (X) qualify generally to do business in any jurisdiction where it
is not then so  qualified,  (Y) take any action that would subject it to general
service of process in any jurisdiction  where it is not then so subject,  or (Z)
subject Xpedior to any material tax in any jurisdiction  where it is not then so
subject.

                   (ix) Cooperate with the Holders and any managing  underwriter
to facilitate the timely  preparation and delivery of certificates  representing
the  Registrable  Securities  to be sold pursuant to a  Registration  Statement,
which  certificates shall be free, to the extent permitted by applicable law, of
all restrictive legends, and to enable such Registrable Securities to be in such
denominations, and registered in such names, as any such managing underwriter or
Holders may request at least two Trading  Days prior to any sale of  Registrable
Securities.

                   (x) Upon the occurrence of any event  contemplated by Section
2(a)(iii)(E),  except as contemplated by Section 2(f), as promptly as reasonably
practicable,  prepare a  supplement  or  amendment,  including a  post-effective
amendment,  to  the  Registration  Statement  or a  supplement  to  the  related
Prospectus or any document  incorporated or deemed to be incorporated therein by
reference,  and file any other  required  documents  such  that,  as  thereafter
delivered,  neither the Registration  Statement nor such Prospectus will contain
any untrue  statement  of a  material  fact or omit to state any  material  fact
required to be stated  therein or necessary to make the statements  therein,  in
light of the circumstances under which they were made, not misleading.

                   (xi) (A) On or prior to the  Filing  Date,  prepare  and file
with the Nasdaq National Market (and any other  securities  exchange,  quotation
system,  market or  over-the-counter  bulletin board, if any, on which shares of
Common  Stock are listed or quoted) an  additional  shares  listing  application
covering  the maximum  number of shares of Common  Stock  issuable in payment of
dividends  upon, or upon  conversion of, the Series B Preferred  Stock (assuming
all dividends are paid in shares of Common Stock ), (B) use its reasonable  best
efforts to cause such shares of Common  Stock to be approved  for listing on the
Nasdaq National Market (and any other  securities  exchange,  quotation  system,
market or  over-the-counter  bulletin  board,  if any, on which shares of Common
Stock are  listed or quoted) on or before  the  applicable  Effectiveness  Date,
including preparing and filing any amendments,  supplements or exhibits thereto,
(C) promptly  provide to the Holders  evidence of such  listing(s),  (D) use its
reasonable  best  efforts  to  keep  such  listing(s)   continuously   effective
throughout the applicable  Effectiveness  Period,  and (E) if at any time during
the  applicable  Effectiveness  Period  the  number of  shares  of Common  Stock
issuable  in payment of  dividends  upon,  or upon  conversion  of, the Series B
Preferred  Stock shall be greater than the number of shares  listed  pursuant to
clause  (A)  above,   promptly  file  one  or  more  additional  shares  listing
applications,  and  promptly  take such other  actions,  such that the number of
shares so issuable shall equal or exceed the number of shares so listed.

<PAGE>

                                      -6-

                   (xii) Enter into such agreements  (including,  if applicable,
an  underwriting  agreement  in form,  scope and  substance  as is  customary in
underwritten  offerings) and take all such other actions in connection therewith
(including  those  reasonably  requested  by any  managing  underwriter  and the
Holders of a majority in interest of the Registrable  Securities  being sold) in
order to expedite or facilitate the disposition of such Registrable  Securities,
and whether or not an  underwriting  agreement  is entered  into,  (A) make such
representations  and  warranties  to  such  Holders  as  may  be  deemed  to  be
underwriters for purposes of Section 2(a)(11) of the Securities Act ("Requesting
Holders")  and  any   underwriters  as  are  customarily   made  by  issuers  to
underwriters  in  underwritten  offerings,  and  confirm  the  same if and  when
reasonably  requested,  (B)  immediately  prior  to  the  effectiveness  of  the
Registration Statement and, in the case of an Underwritten Offering, at the time
of delivery of any  Registrable  Securities  sold pursuant  thereto,  obtain and
deliver copies of opinions of counsel to Xpedior (and updates thereof) addressed
to such Requesting Holders and the managing underwriter,  if any, in form, scope
and  substance  reasonably  satisfactory  to any such managing  underwriter  and
Special  Counsel to such  Requesting  Holders  covering the matters  customarily
covered in opinions  requested in underwritten  offerings and such other matters
as may be reasonably requested by such Special Counsel and managing underwriter,
(C) immediately prior to the effectiveness of the Registration  Statement,  and,
in the  case  of an  Underwritten  Offering,  at the  time  of  delivery  of any
Registrable Securities sold pursuant thereto,  obtain and deliver copies to such
Holders and the managing underwriter,  if any, of "comfort" letters (and updates
thereof) from the independent  certified public  accountants of Xpedior (and, if
necessary,  any other independent certified public accountants of any Subsidiary
of Xpedior or of any business acquired by Xpedior for which financial statements
and  financial  data is, or is  required  to be,  included  in the  Registration
Statement),  addressed to each such Requesting Holder and each  underwriter,  if
any, in form and  substance as are  customary in  connection  with  underwritten
offerings,  (D) if an  underwriting  agreement is entered  into,  the same shall
contain  indemnification  provisions  and  procedures  no less  favorable to the
selling Holders and the underwriters,  if any, than those set forth in Section 4
(or such other  provisions  and procedures  acceptable to Xpedior,  the managing
underwriter,  if any,  and Holders of a majority in interest of the  Registrable
Securities  participating in such Underwritten  Offering),  and (E) deliver such
documents and  certificates  as may be reasonably  requested by the Holders of a
majority in interest of the Registrable Securities being sold by such Requesting
Holders,  their  Special  Counsel and any managing  underwriter  to evidence the
continued validity of the representations and warranties made pursuant to clause
(A) above and to evidence compliance with any customary  conditions contained in
the underwriting agreement or other agreement entered into by Xpedior.

                   (xiii) Make available for inspection by the selling  Holders,
any  representative  of  such  Holders,  any  underwriter  participating  in any
disposition of Registrable Securities and any attorney or accountant retained by
such selling Holders or underwriters, at the offices where normally kept, during
reasonable business hours, all financial and other records,  pertinent corporate
documents  and  properties  of  Xpedior  and its  Subsidiaries,  and  cause  the
officers,  directors,  agents and employees of Xpedior and its  Subsidiaries  to
supply all  information  in each case  reasonably  requested by any such Holder,
representative,  underwriter,  attorney or  accountant  in  connection  with the
Registration  Statement;   provided,  however,  that  such  records,  documents,
properties and information requested to be inspected or supplied are of the kind
reasonably  necessary  to be  inspected  or obtained  by the selling  Holders in
connection with the disposition of the Registrable Securities; provided further,
however, that such persons

<PAGE>
                                      -7-

shall agree to keep  confidential  all  information  that is  determined in good
faith by  Xpedior  in  writing  to be of a  confidential  nature  at the time of
delivery of such  information,  unless (A)  disclosure  of such  information  is
required  by court  or  administrative  order  or is  necessary  to  respond  to
inquiries of regulatory authorities,  (B) disclosure of such information, in the
reasonable  opinion of counsel to such  Person,  is  required  by law,  (C) such
information  becomes generally available to the public other than as a result of
a disclosure  or failure to safeguard  by such Person,  or (D) such  information
becomes  available  to such  Person  from a source  other than  Xpedior and such
source is not known by such  Person to be bound by a  confidentiality  agreement
with Xpedior.

                   (xiv) Comply with all applicable rules and regulations of the
SEC and make  generally  available to its security  holders  earning  statements
satisfying  the  provisions of Section 11(a) of the  Securities Act and Rule 158
promulgated  thereunder  not later  than 45 days  after the end of any  12-month
period  (or 90 days  after the end of any  12-month  period if such  period is a
fiscal  year)  (A)  commencing  at the  end  of  any  fiscal  quarter  in  which
Registrable  Securities are sold to  underwriters  in a firm  commitment or best
efforts  Underwritten  Offering,  and  (B) if not  sold  to  underwriters  in an
Underwritten  Offering,  commencing on the first day of the first fiscal quarter
of  Xpedior  after  the  effective  date of the  Registration  Statement,  which
statement  shall  cover  said  12-month  period  or such  shorter  period  as is
consistent with the requirements of Rule 158.

        (b)        Xpedior may require each selling Holder to furnish to Xpedior
such  information,  including  information  regarding the  distribution  of such
Registrable  Securities,   as  is  required  by  law  to  be  disclosed  in  the
Registration  Statement,  and  Xpedior may exclude  from such  registration  the
Registrable  Securities of any such Holder who fails to furnish such information
within a reasonable time after receiving such request. The failure by Xpedior to
file the  Registration  Statement  by the  Filing  Date,  to cause it to  become
effective by the applicable  Effectiveness Date or to maintain its effectiveness
for the  applicable  Effectiveness  Period,  if due to the  breach of a Holder's
obligations  under this Section 2(b),  shall not be deemed a breach of Xpedior's
obligations under this Agreement or the Purchase  Agreement with respect to such
Holder;  provided,  however,  that Xpedior's  obligations to Holders that timely
furnish such information shall remain in full force and effect.

        (c)        If the Registration Statement refers to any Holder by name or
otherwise  as the holder of any  securities  of Xpedior,  then such Holder shall
have the right to require (if such reference to such Holder by name or otherwise
is not required by the  Securities  Act or any similar  Federal  statute then in
force)  the  deletion  of the  reference  to such  Holder  in any  amendment  or
supplement to the  Registration  Statement  filed or prepared  subsequent to the
time that such reference ceases to be required.

        (d)        Each Holder  agrees by its  acquisition  of such  Registrable
Securities  that it will (i) not  sell  any  Registrable  Securities  under  the
Registration  Statement  until it has received  copies of the Prospectus as then
amended or supplemented as  contemplated in Section  2(a)(vii),  and notice from
Xpedior  that such  Registration  Statement  and any  post-effective  amendments
thereto have become  effective as  contemplated by Section  2(a)(iii),  and (ii)
comply  with the  prospectus  delivery  requirements  of the  Securities  Act as
applicable to such Holder in  connection  with sales of  Registrable  Securities
pursuant to the Registration Statement.

<PAGE>
                                      -8-

        (e)        Each Holder  agrees by its  acquisition  of such  Registrable
Securities  that,  upon receipt of written notice from Xpedior of the occurrence
of any event of the kind  described in Section  2(a)(iii)(B)  through (E),  such
Holder shall forthwith  discontinue  disposition of such Registrable  Securities
under the  Registration  Statement until such Holder (i) has received the copies
of the supplemented  Prospectus and amended Registration  Statement contemplated
by Section 2(a)(x),  or (ii) has been advised in writing by Xpedior that the use
of the applicable  Prospectus may be resumed,  and, in either case, has received
copies of any additional or supplemental filings that are incorporated or deemed
to be incorporated by reference in such Prospectus or Registration Statement.

        (f)        If (i) there is  material  non-public  information  regarding
Xpedior  which  Xpedior's  senior  management  or Board of Directors  reasonably
determines not to be in Xpedior's  best interest to disclose,  and which Xpedior
is not otherwise required to disclose,  or (ii) there is a significant  business
opportunity  or  event  (including,  but not  limited  to,  the  acquisition  or
disposition of assets or any merger, consolidation, tender offer, joint venture,
strategic  alliance or other  similar  transaction)  available to Xpedior  which
Xpedior's senior management or Board of Directors  reasonably  determines not to
be in Xpedior's best interest to disclose,  then Xpedior may postpone or suspend
for any  individual  period of less than 30 days and  aggregate  periods  not to
exceed  90  days  in any  calendar  year  filing  of a  Registration  Statement,
Prospectus,  prospectus supplement or any report, form or statement incorporated
by reference or to be  incorporated  by reference into any of the foregoing,  or
any  amendment  to any of the  foregoing,  and  suspension  of offers  and sales
pursuant to the foregoing,  and, upon delivery of written notice from Xpedior of
any such postponement or suspension,  Holders shall cease and be prohibited from
making any  offers or sales of  Registrable  Securities  pursuant  thereto.  The
Holders shall keep  confidential and not use for any purpose such written notice
and the contents  thereof,  and any related  information,  unless and until such
information  has been disclosed  publicly by Xpedior,  except as required by law
(other than in order to permit  offers and sales of  securities  of Xpedior by a
Holder during such time period) or otherwise agreed to in writing by Xpedior.

     3.  Registration Expenses.
         ----------------------

        (a)        All fees  and  expenses  incident  to the  performance  of or
compliance  with this  Agreement by Xpedior  shall,  except as and to the extent
specified  in Section  3(b),  be borne by Xpedior  whether or not pursuant to an
Underwritten  Offering,  whether or not the  Registration  Statement is filed or
becomes  effective  and  whether  or not any  Registrable  Securities  are  sold
pursuant to the Registration Statement. The fees and expenses referred to in the
foregoing sentence shall include,  without limitation,  (i) all registration and
filing fees (including,  without limitation,  fees and expenses (A) with respect
to filings  required to be made with the Nasdaq  National  Market and each other
securities  exchange,  quotation  system,  market or  over-the-counter  bulletin
board,  if any, on which  shares of Common  Stock are  required  hereunder to be
listed or quoted, and (B) in compliance with state securities or "Blue Sky" laws
(including, without limitation, reasonable fees and disbursements of counsel for
the  Holders  in  connection  with Blue Sky  qualifications  of the  Registrable
Securities,  or exemptions from such  qualification,  and  determination  of the
eligibility of the Registrable  Securities for investment under the laws of such
jurisdictions as the managing underwriter,  if any, or the Holders of a majority
in interest of the  Registrable  Securities  may  reasonably  designate)),  (ii)
printing  expenses   (including,   without

<PAGE>
                                      -9-

limitation, expenses of printing certificates for the Registrable Securities and
of printing  Prospectuses,  if the printing of  Prospectuses is requested by the
managing underwriter, if any, or by the Holders of a majority in interest of the
Registrable  Securities,   included  in  the  Registration   Statement),   (iii)
reasonable  messenger,   telephone,   facsimile  and  delivery  expenses,   (iv)
reasonable fees and disbursements of counsel for Xpedior and one firm of Special
Counsel for the Holders, (v) Securities Act liability  insurance,  if Xpedior so
desires such insurance, and (vi) fees and expenses of all other Persons retained
by Xpedior in connection with the consummation of the transactions  contemplated
by this  Agreement.  In addition,  Xpedior shall be  responsible  for all of its
internal   expenses   incurred  in  connection  with  the  consummation  of  the
transactions contemplated by this Agreement (including,  without limitation, all
salaries  and  expenses  of its  officers  and  employees  performing  legal  or
accounting  duties),  the expense of any annual audit, and the fees and expenses
incurred in  connection  with the listing of the  Registrable  Securities on any
securities exchange as required hereunder.

        (b)        If the Holders request an Underwritten  Offering  pursuant to
the terms hereof,  Xpedior shall be responsible for all costs, fees and expenses
incurred in connection  therewith,  except for the fees and disbursements of the
Underwriters  (including any  underwriting  commissions and discounts) and their
legal counsel and accountants.

     4.  Indemnification.
         ----------------

        (a)        Indemnification by Xpedior.  Xpedior shall,  notwithstanding
any termination of this Agreement,  indemnify and hold harmless each Holder, the
officers,  directors, agents (including its Special Counsel and any underwriters
retained by such  Holder in  connection  with the offer and sale of  Registrable
Securities),   brokers   (including  brokers  who  offer  and  sell  Registrable
Securities as principals as a result of a pledge or any failure to perform under
a margin call of Common  Stock),  investment  advisors and  employees of each of
them, each Person who controls any such Holder (within the meaning of Section 15
of the  Securities  Act or Section  20 of the  Exchange  Act) and the  officers,
directors,  agents and employees of each such controlling Person, to the fullest
extent permitted by applicable law, from and against any and all losses, claims,
damages, liabilities, costs (including, without limitation,  reasonable costs of
preparation  and  reasonable   attorneys'  fees)  and  expenses   (collectively,
"Losses"),  as  incurred,  arising  out of or  relating to any untrue or alleged
untrue statement of a material fact contained in the Registration Statement, any
Prospectus or any form of prospectus,  or in any amendment or supplement thereto
or in any preliminary prospectus,  or arising out of or relating to any omission
or  alleged  omission  of a  material  fact  required  to be stated  therein  or
necessary to make the statements  therein,  in light of the circumstances  under
which they were made,  not  misleading,  except to the  extent,  but only to the
extent,  that (i) such untrue  statements  or  omissions  are based  solely upon
information regarding such Holder furnished in writing to Xpedior by such Holder
expressly  for use therein,  or to the extent that such  information  relates to
such Holder or such Holder's  proposed  method of  distribution  of  Registrable
Securities and was reviewed and expressly approved in writing by such Holder for
use in the Registration  Statement,  such Prospectus or such form of prospectus,
or in any amendment or supplement thereto (including,  without  limitation,  any
information  incorporated  therein  pursuant to Section  2(a)(v)),  or (ii) such
Losses arise directly from the failure of a Holder to comply with the prospectus
delivery  requirements  applicable  to it  (provided  that  Xpedior  has  timely
prepared all necessary prospectus supplements or amendments and provided them to
the  Holders  or their  representatives  in

<PAGE>
                                      -10-

accordance  with the  terms of this  Agreement  and  otherwise  done all  things
required of it in this  Agreement so as not to  adversely  affect the ability of
any Holder to timely comply with such Holder's delivery  requirements).  Xpedior
shall notify the Holders promptly of the institution, threat or assertion of any
Proceeding  of  which  Xpedior  is  aware in  connection  with the  transactions
contemplated by this Agreement.

        (b)        Indemnification by Holders. Each Holder shall,  severally and
not jointly,  indemnify  and hold harmless  Xpedior,  the  directors,  officers,
agents and employees of Xpedior,  each Person who controls  Xpedior  (within the
meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act),
and the directors, officers, agents or employees of such controlling Persons, to
the fullest  extent  permitted by  applicable  law,  from and against all Losses
arising  (i)  solely  out of or based  solely  upon any  untrue  statement  of a
material fact contained in the Registration  Statement,  any Prospectus,  or any
form of  prospectus,  or arising solely out of or based solely upon any omission
of a  material  fact  required  to be stated  therein or  necessary  to make the
statements therein not misleading,  to the extent, but only to the extent,  that
such untrue  statement or omission is contained in any information  furnished in
writing by such  Holder to Xpedior  expressly  for use  therein or to the extent
that such information relates to such Holder or such Holder's proposed method of
distribution of Registrable  Securities and was reviewed and expressly  approved
in writing by such Holder for use in the Registration Statement, such Prospectus
or such form of  prospectus,  or (ii)  directly  from the failure of a Holder to
comply with the prospectus delivery requirements applicable to it (provided that
Xpedior has timely prepared all necessary  prospectus  supplements or amendments
and provided them to the Holders or their representatives in accordance with the
terms of this  Agreement  and otherwise  done all things  required of it in this
Agreement  so as not to  adversely  affect  the  ability of any Holder to timely
comply with such Holder's delivery requirements);  provided, however, that in no
event shall the liability of any selling  Holder  hereunder be greater in amount
than the dollar amount of the net proceeds received by such Holder upon the sale
of the Registrable Securities giving rise to such indemnification obligation.

        (c)        Conduct of Indemnification Proceedings.
                   ---------------------------------------

                   (i) If any  Proceeding  shall be brought or asserted  against
any Person  entitled to  indemnity  hereunder  (an  "Indemnified  Party"),  such
Indemnified  Party shall  promptly so notify the Person from whom  indemnity  is
sought (the "Indemnifying  Party") in writing,  and the Indemnifying Party shall
assume in the defense  thereof,  including the employment of counsel  reasonably
satisfactory to the  Indemnified  Party and the payment of all fees and expenses
reasonably incurred in connection with the defense thereof;  provided,  however,
that the failure of any Indemnified  Party to give such notice shall not relieve
the  Indemnifying  Party of its  obligations  or  liabilities  pursuant  to this
Agreement,  except  (and  only) to the  extent  that  such  failure  shall  have
proximately and materially adversely prejudiced the Indemnifying Party.

                   (ii) An  Indemnified  Party  shall  have the  right to employ
separate  counsel  in any such  Proceeding  and to  participate  in the  defense
thereof,  but the fees and expenses of such  counsel  shall be at the expense of
such Indemnified  Party or Parties unless (A) the Indemnifying  Party has agreed
in writing to pay such fees and expenses,  (B) the Indemnifying Party shall have
failed  promptly to assume the defense of such  Proceeding and to

<PAGE>
                                      -11-

employ counsel  reasonably  satisfactory to such  Indemnified  Party in any such
Proceeding,  or (C) the named  parties  to any such  Proceeding  (including  any
impleaded  parties)  include  both the  Indemnified  Party and the  Indemnifying
Party,  and such  Indemnified  Party shall have been  advised by counsel  that a
conflict of interest is likely to exist if the same  counsel  were to  represent
the  Indemnified  Party  and the  Indemnifying  Party (in  which  case,  if such
Indemnified  Party notifies the Indemnifying  Party in writing that it elects to
employ  separate  counsel  at  the  expense  of  the  Indemnifying   Party,  the
Indemnifying  Party shall not have the right to assume the  defense  thereof and
such  counsel  shall be at the  expense of the  Indemnifying  Party);  provided,
however, that if more than one Indemnified Party is seeking indemnification with
respect to the same Proceeding,  the Indemnifying Party shall not be required to
pay for more than one  separate  counsel for all such  Indemnified  Parties as a
group. The Indemnifying Party shall not be liable for any settlement of any such
Proceeding  effected  without its written  consent,  which  consent shall not be
unreasonably  withheld,  conditioned or delayed.  No  Indemnifying  Party shall,
without the prior written consent of the Indemnified  Party, which consent shall
not be unreasonably withheld,  delayed or conditioned,  effect any settlement of
any pending Proceeding in respect of which any Indemnified Party is a party.

                   (iii)  All  fees  and  expenses  of  the  Indemnified   Party
(including  reasonable  fees and expenses to the extent  incurred in  connection
with  investigating  or  preparing  to defend  such  Proceeding  in a manner not
inconsistent  with this Section 4) shall be paid to the  Indemnified  Party,  as
incurred,  within 20 Trading Days of written notice thereof to the  Indemnifying
Party  (regardless  of whether it is ultimately  determined  that an Indemnified
Party is not entitled to indemnification hereunder;  provided, however, that the
Indemnifying  Party may require such Indemnified Party to undertake to reimburse
all such fees and  expenses  to the extent it is finally  judicially  determined
that such Indemnified Party is not entitled to indemnification hereunder).

        (d)        Contribution.
                   -------------

                   (i) If a claim for indemnification  under Section 4(a) or (b)
is  unavailable  to an  Indemnified  Party  because of a failure or refusal of a
court,  arbitrator or governmental  authority to enforce such indemnification in
accordance  with its terms (by reason of public policy or otherwise),  then each
Indemnifying  Party,  in lieu of  indemnifying  such  Indemnified  Party,  shall
contribute to the amount paid or payable by such  Indemnified  Party as a result
of such Losses,  in such  proportion as is  appropriate  to reflect the relative
fault of the Indemnifying Party and the Indemnified Party in connection with the
actions,  statements or omissions  that resulted in such Losses as well as other
relevant equitable considerations. The relative fault of such Indemnifying Party
and  Indemnified  Party shall be determined by reference to, among other things,
whether any action in question, including any untrue or alleged untrue statement
of a material fact or omission or alleged  omission of a material fact, has been
taken or made by, or relates to information supplied by, such Indemnifying Party
or Indemnified  Party, and the parties'  relative intent,  knowledge,  access to
information  and  opportunity  to correct or prevent such  action,  statement or
omission.  The amount paid or payable by a party as a result of any Losses shall
be deemed to include,  subject to the limitations set forth in Section 4(c), any
reasonable  attorneys'  or other  reasonable  fees or expenses  incurred by such
party in connection with any Proceeding to the extent such party would have been
indemnified  for such fees or

<PAGE>
                                      -12-

expenses if the indemnification  provided for in this Section 4 was available to
such party in accordance with its terms.

                   (ii) The parties  hereto  agree that it would not be just and
equitable if  contribution  pursuant to this Section 4(d) were determined by pro
rata  allocation  or by any other method of  allocation  that does not take into
account  the   equitable   considerations   referred  to  in  Section   4(d)(i).
Notwithstanding the provisions of this Section 4(d), no Holder shall be required
to  contribute,  in the  aggregate,  any  amount in excess of the  amount of net
proceeds  actually  received by such Holder,  and no Person guilty of fraudulent
misrepresentation  (within the meaning of Section 11(f) of the  Securities  Act)
shall be  entitled  to  contribution  from any Person who was not guilty of such
fraudulent misrepresentation.

                   (iii) The indemnity and contribution  agreements contained in
this Section 4 are in addition to any liability  that the  Indemnifying  Parties
may otherwise have to the Indemnified Parties.

     5.  General Provisions.
         -------------------

        (a)        Granting of Other Rights Agreements.  Xpedior shall not grant
any  registration  rights in respect  of any  shares of  capital  stock or other
securities of Xpedior unless such rights are on the same or less favorable terms
than  those that are  granted to the  Holders  under this  Agreement;  provided,
however,  that the Holders  hereby  consent and agree that  Xpedior may grant in
other agreements to other holders of securities of Xpedior  registration  rights
which  rank  ratably  with the  registration  rights  granted  hereunder  to the
Holders.

        (b)        Piggy-Back  Registrations.  If, at any time when there is not
an effective Registration Statement pursuant to this Agreement pertaining to all
of the Registrable Securities,  Xpedior shall determine to prepare and file with
the SEC a registration statement relating to an offering for its own account for
cash or the  account  of others  under the  Securities  Act of any of its common
stock,  other than on Form S-4 or Form S-8 relating to equity  securities  to be
issued solely in connection  with any  acquisition  of any entity or business or
equity securities issuable in connection with any stock option or other employee
benefit  plan,  Xpedior  shall  send to each  Holder of  Registrable  Securities
written  notice of such  determination  and, if within 20 days after  receipt of
such notice, any such Holder shall so request in writing,  Xpedior shall include
in such  registration  statement all or any part of the  Registrable  Securities
such Holder requests to be registered; provided, however, that Xpedior shall not
be required to register any shares of  Registrable  Securities  pursuant to this
paragraph  that  are  eligible  for  sale  pursuant  to Rule  144(k)  under  the
Securities  Act.  If the  total  amount  of  securities,  including  Registrable
Securities,  to be included in such registration statement exceeds the amount of
securities  that the  managing  underwriter  (or,  if the  offering is not being
underwritten,  Xpedior's Board of Directors) determines, in its written opinion,
in good faith is compatible with the success of the offering, then the number of
shares that may be included in the registration  statement shall be allocated as
follows: first, to Xpedior (or, if the offering is being made for the account of
Persons  other than  Xpedior and not in  violation  of any rights of the Holders
pursuant to this  Agreement,  to such Persons),  second,  to the Holders and any
holders  of  Parity  Stock on a pro rata  basis  based on the  total  number  of
Registrable  Securities and Parity Stock held by such Persons, and third, to any
other  Persons  participating  in such  offering  on a pro rata  basis.  No such
reduction  shall  reduce

<PAGE>
                                      -13-

the amount of  Registrable  Securities  of the selling  Holders  included in the
registration  below  15% of the  total  amount of  securities  included  in such
registration,  unless such Holders are afforded,  at any time more than 120 days
after the effective date of such registration, the right to an additional demand
shelf registration pursuant to Section 1 hereof. In no event shall any shares of
any other selling  stockholder be included in any registration of securities for
the account of Xpedior  that would reduce the number of  Registrable  Securities
that may be included in such  registration  by the  Holders.  As a condition  to
participation in any such  underwritten  offering,  each Holder shall enter into
such  underwriting,  lock-up  and  other  agreements,  and  execute  such  other
instruments,  as is customary  in an  underwritten  offering.  As a condition to
participation in any such non-underwritten offering, each Holder shall cooperate
to provide such  information  necessary for the preparation of the  Registration
Statement as is customary in a non-underwritten offering.

        (c)        Notices.  All  notices  or other  communications  under this
Agreement  shall be in  writing  and shall be given (and shall be deemed to have
been duly  given  upon  receipt)  by  delivery  in  person,  by  telecopy  (with
confirmation of receipt),  or by registered or certified mail,  postage prepaid,
return  receipt  requested,  addressed  in  accordance  with  Section 6.2 of the
Purchase Agreement.

        (d)        Specific   Performance.   The  parties   hereto  agree  that
irreparable  damage would occur in the event that any of the  provisions of this
Agreement  were not performed in accordance  with their  specific  terms or were
otherwise breached. Accordingly, the parties further agree that each party shall
be entitled to an injunction or  restraining  order to prevent  breaches of this
Agreement,  and to  enforce  specifically  the terms and  provisions  hereof and
thereof in any court of the United States or any state having jurisdiction, this
being in  addition  to any  other  right or remedy  to which  such  party may be
entitled under this Agreement, at law or in equity.

        (e)        Assignment;  Parties in Interest.  The rights of each Holder
hereunder,  including the right to have Xpedior register for resale  Registrable
Securities  in  accordance   with  the  terms  of  this   Agreement,   shall  be
automatically  assignable by the Holder, to any permitted assignee or transferee
of all or a portion of the  Registrable  Securities  if (i) the Holder agrees in
writing with the  transferee  or assignee to assign such  rights,  and a copy of
such  agreement  is furnished  to Xpedior  within a  reasonable  time after such
assignment,  (ii) Xpedior is,  within a reasonable  time after such  transfer or
assignment,  furnished  with written  notice of (A) the name and address of such
transferee  or  assignee,  and (B) the  securities  with  respect  to which such
registration  rights are being  transferred  or assigned,  (iii)  following such
transfer  or  assignment  the  further  disposition  of such  securities  by the
transferee or assignees is restricted  under the  Securities  Act and applicable
state  securities  laws,  and (iv) at or before the time  Xpedior  receives  the
written notice  contemplated by clause (ii) of this Section 5(e), the transferee
or assignee  agrees in writing with Xpedior to be bound by all of the provisions
of this  Agreement.  The rights to  assignment  shall apply to the Holder and to
subsequent  permitted  successors and assigns.  Subject to the  foregoing,  this
Agreement  shall be binding  upon and inure  solely to the benefit of each party
hereto and the Indemnified  Parties,  and nothing in this Agreement,  express or
implied, is intended to or shall confer upon any other Person any right, benefit
or  remedy  of any  nature  whatsoever  under or by  reason  of this  Agreement,
including any third party beneficiary rights.

<PAGE>
                                      -14-

        (f)        Governing  Law.  This  Agreement  shall be  governed  in all
respects  by the laws of the State of  Delaware  (without  giving  effect to the
provisions thereof relating to conflicts of law). The nonexclusive venue for the
adjudication  of any dispute or proceeding  arising out of this Agreement or the
performance  hereof shall be the courts located in Newcastle  County,  Delaware,
and the parties hereto and their  Affiliates each consents to and hereby submits
to the  jurisdiction of any court located in Newcastle  County,  Delaware or any
Federal courts located in Delaware.

        (g)        Headings.  The  descriptive  headings herein are inserted for
convenience  of  reference  only and are not intended to be part of or to affect
the meaning or interpretation of this Agreement.

        (h)        Certain Definitions. As used in this Agreement:

                  "Affiliate",  as applied to any Person, means any other Person
directly or indirectly controlling, controlled by, or under common control with,
that  Person;  for  purposes  of this  definition,  "control"  (including,  with
correlative meanings, the terms "controlling," "controlled by" and "under common
control  with"),  as applied to any Person,  means the  possession,  directly or
indirectly,  of the power to direct or cause the direction of the management and
policies of that Person, whether through the ownership of voting securities,  by
contract or otherwise.

                  "Agreement"  has the meaning set forth in the preamble to this
Agreement.

                  "Common Stock" means  Xpedior's  common stock,  par value $.01
per share.

                  "Demand Notice" has the meaning set forth in Section 1(a).

                  "Effectiveness  Date" has the  meaning  set  forth in  Section
1(a).

                  "Effectiveness  Period"  has the  meaning set forth in Section
1(a).

                  "Exchange Act" means the  Securities  Exchange Act of 1934, as
amended.

                  "Filing Date" has the meaning set forth in Section 1(a).

                  "Holder"  or  "Holders"  means any  record  holder of Series B
Preferred  Stock or of Common Stock issued in payment of dividends upon, or upon
conversion  of, Series B Preferred  Stock who is a party to this Agreement or is
otherwise  entitled  to the  benefits  of this  Agreement.  When this  Agreement
specifies a  percentage,  number or  proportion  of the  Registrable  Securities
required to take some action,  each Holder of Series B Preferred Stock, as such,
shall be  deemed to be a Holder of the  number  of shares of Common  Stock  into
which such Series B Preferred Stock is convertible.

                  "Indemnified Party" has the meaning set forth in Section 4(c).

                  "Indemnifying  Party"  has the  meaning  set forth in  Section
4(c).

<PAGE>
                                      -15-

                  "Losses" has the meaning set forth in Section 4(a).

                  "Original  Issue Date" has the meaning set forth in  Xpedior's
Certificate  of  Designations  to be filed with the Delaware  Secretary of State
with respect to the Series B Preferred Stock.

                  "Parity  Stock" means any capital  stock of Xpedior that ranks
on parity with the Series B Preferred  Stock as to redemption,  conversion,  the
payment of dividends or distribution  of assets upon a liquidation,  dissolution
or winding up of Xpedior, including without limitation Xpedior's Series A 8 1/2%
Cumulative Convertible Preferred Stock.

                  "Person"    shall    include    individuals,     corporations,
partnerships,  limited liability  companies,  trusts,  other entities and groups
(which term shall include a "group" as such term is defined in Section  13(d)(3)
of the Exchange Act).

                  "Proceeding" means any action,  claim, suit,  investigation or
proceeding   (including,   without  limitation,   an  investigation  or  partial
proceeding, such as a deposition), whether commenced or threatened.

                  "Prospectus" means the prospectus or prospectuses  included in
the Registration  Statement  (including,  without limitation,  a prospectus that
includes any information  previously  omitted from a prospectus filed as part of
an  effective  registration  statement  in  reliance  upon Rule  430A  under the
Securities Act), as amended or supplemented by any prospectus  supplement,  with
respect  to  the  terms  of  the  offering  of any  portion  of the  Registrable
Securities covered by the Registration  Statement,  and all other amendments and
supplements to the Prospectus  (including pre- and  post-effective  amendments),
all exhibits thereto and all material  incorporated by reference or deemed to be
incorporated by reference into such prospectus.

                  "PSINet"  has the  meaning  set forth in the  preamble to this
Agreement.

                  "Purchase Agreement" has the meaning set forth in the recitals
to this Agreement.

                  "Registrable  Securities"  at any time means (i) the shares of
Common Stock issued in payment of dividends  upon, or upon conversion of, Series
B  Preferred  Stock,  provided  such  shares are held by a Holder,  and (ii) the
shares of Common Stock that are issuable at that time in payment of declared but
unpaid  dividends  upon, or upon  conversion  of, Series B Preferred  Stock by a
Holder thereof (regardless of whether a conversion notice has been given).

                  "Registration  Statement" means the registration  statement or
statements   contemplated  by  Section  1(a),   including  (in  each  case)  the
Prospectus,  amendments  and  supplements  to  such  registration  statement  or
statements or Prospectus  (including pre- and  post-effective  amendments),  all
exhibits  thereto,  and all material  incorporated  by reference or deemed to be
incorporated by reference into such registration statement or statements.

                  "Requesting  Holder" or  "Requesting  Holders" has the meaning
set forth in Section 2(a)(xii).

<PAGE>
                                      -16-

                  "SEC" means the Securities and Exchange Commission.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Series  B  Preferred  Stock"  means  Xpedior's  Series  B  9%
Cumulative Convertible Preferred Stock, par value $.01 per share.

                  "Special Counsel" has the meaning set forth in Section 2(a).

                  "Subsidiary" or "Subsidiaries"  means, with respect to PSINet,
Xpedior or any other  Person,  any  corporation,  partnership,  joint venture or
other legal entity of which PSINet,  Xpedior or such other  Person,  as the case
may be (either  alone or through or together with any other  Subsidiary),  owns,
directly or indirectly, stock or other equity interests the holders of which are
generally entitled to more than 50% of the vote for the election of the board of
directors or other governing body of such corporation or other legal entity.

                  "Trading  Day"  means (i) a day on which the  Common  Stock is
traded on the Nasdaq  National Market or other national  securities  exchange or
quotation system on which the Common Stock is then listed or quoted, (ii) if the
Common Stock is not listed or quoted on the Nasdaq  National Market or any other
national  securities  exchange or  quotation  system,  a day on which the Common
Stock is traded in the over-the-counter  market, as reported by the OTC Bulletin
Board,  or (iii) if the Common Stock is not quoted on the OTC Bulletin  Board, a
day on which  the  Common  Stock is  quoted  in the  over-the-counter  market as
reported  by  the  National  Quotation  Bureau   Incorporated  (or  any  similar
organization or agency succeeding to its functions of reporting prices).

                  "Underwritten Offering" means an offering in which Registrable
Securities  are  sold to one or  more  underwriters  for  resale  to the  public
pursuant to an  effective  Registration  Statement,  provided  that the managing
underwriter executes and delivers to Xpedior a confidentiality agreement in form
and substance reasonably satisfactory to Xpedior.

                  "Xpedior"  has the meaning  set forth in the  preamble to this
Agreement.

        (i)        Counterparts.  This Agreement may be executed in two or more
counterparts which together shall constitute a single agreement.

        (j)         Severability.  If  any  term  or  other  provision  of  this
Agreement is invalid,  illegal or incapable of being enforced by any rule of law
or  public  policy,  all other  terms and  provisions  of this  Agreement  shall
nevertheless  remain in full force and effect so long as the  economics or legal
substance of the transactions contemplated hereby are not affected in any manner
materially  adverse to either party. Upon  determination  that any term or other
provision hereof is invalid, illegal or incapable of being enforced, the parties
hereto shall  negotiate  in good faith to modify this  Agreement so as to effect
the original  intent of the parties as closely as possible to the fullest extent
permitted  by  applicable  law in an  acceptable  manner  to the  end  that  the
transactions contemplated hereby are fulfilled to the extent possible.

        (k)         Amendments and Waivers.  The  provisions of this  Agreement,
including  the  provisions  of this  sentence,  may not be amended,  modified or
supplemented,  and waivers or
<PAGE>
                                      -17-

consents to departures from the provisions  hereof may not be given,  unless the
same shall be in  writing  and  signed by  Xpedior  and the  Holders of at least
two-thirds in interest of the then outstanding Registrable Securities; provided,
however,  that, for the purposes of this sentence,  Registrable  Securities that
are owned,  directly or  indirectly,  by Xpedior or a  controlled  Affiliate  of
Xpedior shall not be deemed to be outstanding.  Notwithstanding the foregoing, a
waiver or consent to depart from the provisions  hereof with respect to a matter
that relates  exclusively  to the rights of certain  Holders,  and that does not
directly  or  indirectly  affect  the rights of other  Holders,  may be given by
Holders of at least a majority  in  interest of the  Registrable  Securities  to
which such waiver or consent relates; provided,  however, that the provisions of
this sentence may not be amended, modified, or supplemented except in accordance
with the provisions of the immediately preceding sentence.

        (l)         Shares  Held by Xpedior  and its  Affiliates.  Whenever  the
consent  or  approval  of  Holders  of a  specified  percentage  of  Registrable
Securities is required hereunder,  Registrable Securities held by Xpedior or its
controlled  Affiliates shall not be counted in determining  whether such consent
or approval was given by the Holders of such required percentage.

        (m)        Rules of Construction.
                   ----------------------

                   (i)  References in this Agreement to any gender shall include
references to all genders. Unless the context otherwise requires,  references in
the singular  include  references in the plural and vice versa.  References to a
party to this  Agreement  or to other  agreements  described  herein means those
Persons executing such agreements.

                   (ii) The words  "include",  "including" and "includes"  shall
each be deemed to be followed by the phrase  "without  limitation" or the phrase
"but not limited to" in all places  where such words  appear in this  Agreement.
The word "or" shall be deemed to be inclusive.

                   (iii) This Agreement is the joint drafting  product of PSINet
and Xpedior,  and each provision has been subject to  negotiation  and agreement
and shall not be construed for or against either party as drafter thereof.


<PAGE>



     IN WITNESS  WHEREOF,  PSINet and Xpedior  have caused this  Agreement to be
signed by their respective officers thereunto duly authorized all as of the date
first written above.

                                            PSINET INC.

                                            By: /s/ Lawrence E. Hyatt
                                               -----------------------------
                                                 Name:  Lawrence E. Hyatt
                                                 Title: Executive Vice President


                                            XPEDIOR INCORPORATED


                                            By: /s/ J. Brian Farrar
                                               -----------------------------
                                                 Name:   J. Brian Farrar
                                                 Title:  President



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